When mining with ethminer.exe I get a lot of blocks very quickly, and then I get this message; which I don't understand: We are too far in the future. Waiting for 5s

I0210 21:55:34.816257    4972 worker.go:447]    Mined 5 blocks back: block #460911
I0210 21:55:34.817259    4972 worker.go:569] commit new work on block 460917 with 0 txs & 0 uncles. Took 501.5µs
I0210 21:55:35.340652    4972 worker.go:348]   Mined block (#460917 / 37856e1b). Wait 5 blocks for confirmation
I0210 21:55:35.341655    4972 worker.go:569] commit new work on block 460918 with 0 txs & 0 uncles. Took 0
I0210 21:55:35.342154    4972 worker.go:447]    Mined 5 blocks back: block #460912
I0210 21:55:35.343659    4972 worker.go:569] commit new work on block 460918 with 0 txs & 0 uncles. Took 500.3µs
I0210 21:55:35.881088    4972 worker.go:348]   Mined block (#460918 / 780d16ba). Wait 5 blocks for confirmation
I0210 21:55:35.881088    4972 worker.go:470] We are too far in the future. Waiting for 5s

Also the miner comes up like, but I'm not sure why:

  i  21:55:41|main    Nonce: 2d82a72d51b105b8
  i  21:55:41|main  B-) Submitted and accepted.
  m  21:55:41|main  Getting work package...
  m  21:55:41|main  Got work package: #e2399bba
  i  21:55:41|cudaminer0  set work; seed: #3db89d40, target: #0000042f1a11
  i  21:55:41|main  Solution found; Submitting to 127.0.0.1:39342 ...
  i  21:55:41|main    Nonce: 2d82a72d51f57ee4
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:55:53|main  Mining on PoWhash #e2399bba : 0.335=0.335MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:56:05|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:56:17|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:56:29|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:56:41|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:56:53|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:57:05|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:57:17|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:57:29|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:57:41|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0
JSON-RPC problem. Probably couldn't connect. Retrying in 1...
  m  21:57:54|main  Mining on PoWhash #e2399bba : 0=0MH/s A338+0:R0+0